High pressure mechanical seal for cables and power lines in oil wells

Abstract

The present high pressure mechanical seal features a novel configuration capable of sealing from one up to simultaneously five power conduction lines, flow injection lines or control lines, in the same device. Adaptable to different configurations, types and size of conduction lines existing in the industry. The power conduction lines can be a cable of an electro-submersible pump or the cable in a down hole heater; the flow and control lines can be diluents injector capillaries or data and instrumentation cables or any other type of conduction line which can enter the inner atmosphere of the wellbore. Conduction lines are generally shaped as uniform cylindrical elements, which vary in diameter and material due to the cylindrical geometry, are adaptable to the sealing system of the present invention, such that the equipment can seal from only one line up to five lines depending on the requirement of the user.

The invention claimed is: 
     
       1. A high pressure mechanical seal comprising:
 an adapter bushing comprising a first portion having a first outer surface and a first thread defined on the first outer surface, the first portion having a first diameter, the first portion further comprising a first cavity; 
 a seal seat comprising one or more cylindrical perforations that pass through the seal seat, the seal seat further comprising a second outer surface that comprises a plurality of second cavities, and a plurality of static joints disposed in the plurality of second cavities, the seal seat being adapted to fit into the first cavity of the adapter bushing, wherein the plurality of static joints forms a seal between the adapter bushing and the seal seat when the seal seat is housed in the adapter bushing; 
 a main sealing body comprising a cylindrical base and one or more cylindrical projections, wherein each of the one or more cylindrical projections includes a region having a diameter that decreases as a distance from the cylindrical base increases and a hole that passes through the cylindrical base and the respective cylindrical projection, wherein the respective cylindrical projection is adapted to fit into a corresponding one of the one or more cylindrical perforations of the seal seat; and 
 a seal head having a second portion comprising an inner surface and a second thread defined on the inner surface, the second portion of the seal head having a second diameter greater than the first diameter of the first portion of the adapter bushing, the seal head being adapted to fit over an end portion of the adapter bushing, wherein the second thread of the seal head is adapted to couple to the first thread of the adapter bushing. 
 
     
     
       2. The high pressure mechanical seal according to  claim 1 , wherein the adapter bushing further comprises a third portion having a third outer surface, and a third thread disposed on the third outer surface of the third portion, the third thread being adapted to connect to a dangler of a production pipeline inside a wellbore, wherein the plurality of static joints of the seal seat comprise two static rubber joints. 
     
     
       3. The high pressure mechanical seal according to  claim 2 , wherein the seal seat is cylindrical and has a height between 40 and 50 mm, wherein each of the one or more cylindrical perforations of the seal seat is adapted to receive a corresponding one of the one or more cylindrical projections of the main sealing body, the seal seat further comprising a threaded perforation that does not pass through the seal seat, the threaded perforation being adapted to facilitate extraction of the seal seat from the adaptor bushing during a system uninstall process. 
     
     
       4. The high pressure mechanical seal according to  claim 3 , wherein the cylindrical base of the main sealing body has a height and a third diameter, the height being less than the third diameter, wherein a fourth diameter of each of the one or more cylindrical projections of the main sealing body decreases by 20 to 15 mm from the cylindrical base to a region in a middle of the respective cylindrical projection, each of the one or more cylindrical projections also comprising an end section having a uniform diameter, wherein the main sealing body is formed of an elastomer. 
     
     
       5. The high pressure mechanical seal according to  claim 4 , wherein the seal head is substantially cylindrical and comprises a neck having a fifth diameter and a body portion, wherein the second portion having the second thread is disposed in the body portion, the fifth diameter of the neck being less than the second diameter of the second portion.